Yarn supply means in textile twisting machines



March 29, 1960 F/WRIGHT YARN SUPPLY MEANS IN TEXTILE TWISTING MACHINES Filed Aug. 29, 1958 3 Sheets-Sheet l March 29, 1960 F. WRIGHT 2,930,181

YARN SUPPLY MEANS IN TEXTILE TWISTING MACHINES Filed Aug. 29. 1958 3 Sheets-Sheet 2 March 29, 1960 I F. WRIGHT 2,930,181

YARN SUPPLY MEANS IN TEXTILE TWISTING MACHINES Filed Aug. 29, 1958' 3 Sheets-Sheet 3 if. Q

United States Patent O YARN SUPPLY MEANS IN TEXTILE TWISTING MACHINES Frank Wright, Haworth, Keighley, England, assignor to Prince-Smith & Stells Limited, Keighley, England Application August 29, 1958, Serial No. 758,120

Claims priority, application Great Britain September 2, 1957 Claims. (Cl, 57-83) The invention is concerned with textile twisting machines wherein the supply yarns to be twisted are combined at a delivery roller over which they are wrapped before passing to the twisting unit, and it has for its object to provide means whereby the delivery roller assembly and the spindle are prevented from starting unless said supply yarns have been correctly wrapped about the delivery roller.

Where the delivery roller assembly is constituted by a single delivery roller about which the combined yarns must be wrapped twice to ensure their delivery at a predetermined speed, the invention provides a tumbler incorporating two yarn guides which are respectively adapted to receive the yarns at one of such wraps about said roller, so that when the yarns are correctly arranged the tumbler is held in an inoperative balanced condition, whilst failure to wrap the yarns correctly causes the tumbler to become unbalanced and thereby to actuate a member preventing rotation of the delivery roller.

The machine may also comprise in respect of each twisting unit, a yarn trap which, should an attempt be made to start a spindle without threading the combined yarns through the delivery roller assembly, is located in the path which said yarns will then follow and will be effective to nip the yarns and prevent their delivery to the traveller.

The manner in which the invention'ma'y be carried into effect is hereinafter described with reference to the accompanying diagrammatic drawings. Fig. 1 of said drawings is a front elevation of the single delivery roller assembly of a textile twisting machine, and Fig. 2 is a plan thereof; these figures show the positions of the parts when the delivery roller has been wrapped correctly. Figs. 3 and 4 are views respectively similar to Figs. 1 and 2, showing the positions of the parts when the delivery roller has been wrapped incorrectly.

Fig. 5 is a side elevation illustrating the yarn trap, in the operative condition in solid lines and in the inoperative condition in dotted lines.

In the drawings, the numerals 10, etc. designate guide-members which form parts of stop-motion detectors sensitive to the tension of the supply yarns A, B, C and D in their passage from the creel (not shown) to the delivery roller 11.

It is essential that the combined supply yarns A, B, C and D should be wrapped twice about the periphery of said roller 11. To ensure that this is not overlooked by the machine attendant on threading up preparatory to starting operations, a pair of axially spaced grooved e 2,930,181 3 e aia-1a? 1 Pivoted upon a spindle 16 fixed to said arbor 14 between said rollers 12, 13 is a double-armed yarn guide 17, each arm of the guide being arranged to engage the wrap of yarns passing around one of said rollers 12, 13. When the yarns are correctly threaded-up as shown in Figs. 1 and 2, the tension in the two wraps E, F holds the yarn guide 17 in a balanced position, and the counter-balanced member 15 is held against a limiting stop 18. Should however the yarns be passed around the delivery roller 11 only once, so that only one arm of the yam-guide 17 is in use, the balanced condition is upset and the member 15 is allowed to fall into a position in which the part 151 thereof constitutes a wedge cooperating with the surface of the delivery roller 11 to prevent rotation of the latter.

To ensure that the delivery of yarns to the traveller is trapped in case the machine attendant should fail to wrap the yarns about the delivery roller 11, the machine is provided with a length of helically coiled tension spring 19, looped on itself to circular (or part-circular) formation, and mounted by means of a bracket 20 in a position at which it will be engaged by the yarns A, B, C, D in a direction path from the individual stop-motion detectors 10, 10 and an eye 21 which is connected to a stopmotion detector sensitive to tension of the combined yarns between the delivery roller 11 and the traveller. As will be seen from Fig. 5, when the yarns A, B, C and D are correctly passed about the delivery roller 11, their path lies well clear of the spring trap 19, but were an attempt made to start the spindle before wrapping the yarns about the delivery roller, it will be apparent from the path shown in dotted lines in Fig. 5 that the yarns would be nipped by or trapped in the coils of said spring 19, and delivery to the traveller thereby prevented. Said trap 19 may be mounted so as to be capable of pivoting into an inoperative position to facilitate access to the delivery roller 11 for threading up.

What I claim as my invention and desire to secure by Letters Patent is:

1. A textile twisting machine having a delivery roller over which each of the yarn to be twisted is woundby a wrap before passing to the twisting unit, comprising a tumbler incorporating two yarn guides each adapted to receive the yarns at one of such wraps about the delivery roller, a member which is connected with the tumbler and movable into a position in which it arrests rotation of the delivery roller, said tumbler being mounted so that when the yarns are correctly arranged it is held in a balanced condition in which said stopping member is maintained inoperative, whilst failure to wrap the yarns correctly causes the tumbler to become unbalanced and thereby to actuate said member to stop the delivery roller.

'2. A machine as claimed in claim 1, wherein there is also provided in respect of each spindle a yarn trap which, should an attempt be made to start the spindle without threading the combined yarns through the delivery roller assembly, is located in the path which said yarns will then follow and will be effective to nip the yarns and prevent their delivery to the traveller.

2: A mach ne as .4m 1 cla 1, wh the his! is an arm ha in a arn. g id a ea end n pi oted at an intermediate point on a counter-weighted Iver associated with the roller-stopping member.

4. A machine as claimed in claim 3, wherein the counter-weighted lever is provided with a wedge which, when the tumbler becomes unbalanced and the lever moves to an operative position, cooperates with a surface of the delivery roller to prevent its rotation.

5. A machine as claimed in claim 2, wherein the yarn trap comprises a helically coiled tension spring looped into a circular or part-circular formation and mounted in a position in which it will be engaged by the yarns lll l these are wrapped abeqt the deliver roll r- References Cited in the file of this patent UNITED STATES PATENTS 1,840,262 Simonson et al. Jan. 5, 1932 2,716,858 Schaurn Sept. 6, 1955 FOREIGN PATENTS 633,374 France Oct. 24, 1927 

